Maximize the effectiveness of your .300 AAC Blackout-chambered rifle with the M-300 by Nikon. Engineered especially for this popular round, it's designed to take full advantage of both supersonic and subsonic ammunition. The special illuminated BDC SuperSub reticle provides aim and holdover points for both variants of the .300 AAC Blackout cartridge. The Nikon spot on custom turrets are designed to provide exactly the adjustment you need for your load.